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SubjectRe: RFC: New kernel proc interface
Date
In linux.dev.kernel, article <XFMail.961101042606.rriggs@tesser.com>,
Rob Riggs <rriggs@tesser.com> writes:
>
> - The point Alan brought up does not affect Joe Average User,
> but rather very busy network boxes. And it will only be a
> problem on very busy network boxes that are tight on memory
> _and_ needs to access the /proc/net files.
>
Umm, I'd hesitate to call six MBytes of free RAM just to read
/proc/net/routes (or whatever) "tight on memory". I'd call it "completely
thrashes memory on the system".

Besides, /proc/net/routes is special. It has 128-byte records, and reading
any particular record twice (or not at all) is not a problem because
usually, the table stays stable, and the code which reads the table must be
able to deal with the problem (because on other systems, it reads kernel
memory or similar, where there are no guarantees either).

> - My goal is to actually eliminate some of the kernel bloat
> by making generic proc routines that most of the current proc
> code can be easily modified to use. The end result will be
> make Linux a little leaner.
>
Which is a very good idea, actually. It just doesn't work for some of these
files in /proc.

> That being said, I need to know where this patch will cause problems
> and what I need to watch out for. I am also a little concerned by
> how long it would take the kernel to write out 40K worth of route
> information (using Alan's example) since many proc routines just
> use cli/sti to lock down the tables that they are operating on.
>
Don't Do That. Copying a couple of MBytes under cli() is out of the
question. Really.

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